I guess that the final reason why someone can even think about taking this decision is to have passive earnings or enough savings to survive some months without income.
I did this in the past. I had a good amount of savings and I was in my 20's, so I didn't mind so live frugally. Also, worst case scenario, I could go back at my parents and eat and sleep for free until finding a new job.
My reason was that I wanted to travel. I went to London and found a job there. It was a really nice experience, that leaded me to more travel and better jobs. Now, in my 40's and with a familly, I would not be able to do it again.
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